319 
articular crista and furrow in the scutum are extraordinarily strongly 
developed; we might indeed presume that a concrescence of art¬ 
icular and adductor ridges had taken place. In correspondance with 
this the articular furrow of the tergum is exceedingly deep and 
broad, and the apical part extraordinarily compact. 
Fig. 60. 
Figs. 59 and 60. Balanus minutus from 15 fathoms, off Jolo. 
Fig. 59. a and b external view of tergum and sculum, c and d inside view 
of scutum and tergum. [x 25]. 
Fig. 60. a labrum, b mandible, c maxilla. [x 100]. 
Among the features of the animal the mouth parts (Fig. 60) of 
the specimens so entirely agree with the other specimens of Ba¬ 
lanus minutus that a separation, if reasonable, must be based upon 
the opercular plates, and upon the faet that the intermediate seg¬ 
ments of cirrus III carry four small spines on their anterior side 
instead of two or three. It is indeed not justifiable to look on the 
specimens as representatives of another species, and I do not even 
